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Ghost relieving circuit for display panel, display panel and ghost relieving method for display panel

a display panel and ghost-relieving technology, applied in the field of display technologies, can solve the urgent problem of solving the ghost problem of the liquid crystal display panel, and achieve the effect of accurately controlling the symmetry of the positive and effectively reducing the sticking of the display panel

Active Publication Date: 2019-10-31
XIANYANG CAIHONG OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a new method and apparatus for improving the image quality of display panels. The technical effects of the invention include reducing ghosting, improving the driving force, and reducing cost. By keeping the common voltage constant and adjusting the positive-polarity reference voltage and negative-polarity reference voltage, the voltage range of the reference voltage to the first working voltage and the voltage range of the reference voltage to the second working voltage have an overlapped range, reducing ghost of the display panel. Additionally, the output buffer formed by the first switching transistor and the second switching transistor of the ghost relieving circuit provided by the present invention only needs to be close to the highest and lowest differential pressure of the half width, ensuring the state of the display content of the display panel. The invention also adjusts the input voltage across the sub-pixel by keeping the Vcom voltage constant, resulting in more accurate control of the symmetrical positive and negative-polarity pixel voltages in the entire display panel area, effectively reducing the ghost and image sticking of the display panel.

Problems solved by technology

On the other hand, the liquid crystal molecules in the liquid crystal display panel are fixed at a certain voltage for a long time, which causes the ions around the liquid crystal molecules to move toward the glass direction, and even some ions may adhere to the alignment film.
Therefore, how to improve the ghost problem of the liquid crystal display panel has become an urgent problem to be solved.

Method used

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  • Ghost relieving circuit for display panel, display panel and ghost relieving method for display panel
  • Ghost relieving circuit for display panel, display panel and ghost relieving method for display panel
  • Ghost relieving circuit for display panel, display panel and ghost relieving method for display panel

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embodiment 1

[0045]Please refer to FIG. 2 and FIG. 3, FIG. 2 is a schematic block diagram of a ghost relieving circuit for a display panel according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a specific circuit structure of a ghost relieving circuit for a display panel according to an embodiment of the present invention. Specifically, the ghost relieving circuit includes a digital-to-analog converter 1, a first switching circuit 2, a second switching circuit 3, and a gamma chip 4.

[0046]The digital-to-analog converter 1 is connected to the first switching circuit 2 and the second switching circuit 3, the gamma chip 4 is connected to the digital-to-analog converter 1 for providing a plurality of reference voltages to the digital-to-analog converter 1.

[0047]In an embodiment of the invention, the first switching circuit 2 includes a first switching transistor M1 and a second switching transistor M2. The positive output end Vpout of the digital-to-analog converter 1 i...

embodiment 2

[0053]Please refer to FIG. 1 to FIG. 3 again, and see also FIG. 4, FIG. 4 is a schematic diagram of a gray scale offset manner according to an embodiment of the present invention. A ghost relieving circuit of a display panel according to an embodiment of the present invention will be described in detail below. As shown in FIG. 2, the ghost relieving circuit includes a digital-to-analog converter 1, a first switching circuit 2, a second switching circuit 3, and a gamma chip 4. The digital-to-analog converter 1 is connected to the first switching circuit 2 and the second switching circuit 3. The gamma chip 4 is connected to the digital-to-analog converter 1 for providing a plurality of reference voltages to the digital-to-analog converter 1.

[0054]Specifically, as shown in FIG. 3, the first switching circuit 2 includes a first switching transistor M1 and a second switching transistor M2, and the second switching circuit 3 includes a third switching transistor M3 and a fourth switching ...

embodiment 3

[0064]Referring to FIG. 5, FIG. 5 is a schematic structural diagram of a liquid crystal display panel according to an embodiment of the present invention. The liquid crystal display panel of this embodiment includes a timing controller 101, a gate driver 102, a source driver 103, and a pixel matrix 104.

[0065]The timing controller 101 is configured to form a scan line control timing, a first data line control timing, and a second data line control timing, the first data line control timing and the second data line control timing are formed respectively according to the first gray scale and the second gray scale formed from the original image gray scale (also known as input image gray scale).

[0066]In one embodiment, the timing controller 101 includes a sub-pixel lookup table, and the lookup table is composed of original image gray scales corresponding to sub-pixels at predetermined positions, corresponding first gray scales, and corresponding second gray scales. The first gray scale a...

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PUM

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Abstract

The invention relates to a ghost relieving circuit for a display panel including a digital-to-analog converter, a first switching circuit, a second switching circuit, and a gamma chip. The gamma chip is connected to the digital-to-analog converter and configured to provide a plurality of reference voltages to the digital-to-analog converter. The digital-to-analog converter is individually connected to the first switching circuit and the second switching circuit, the first switching circuit is connected to receive a first working voltage and a positive-polarity reference voltage and has an positive-polarity data voltage output end, the second switching circuit is connected to receive a second working voltage and a negative-polarity reference voltage and has a negative-polarity data voltage output end, and the positive-polarity reference voltage is less than the negative-polarity reference voltage.

Description

FIELD OF THE DISCLOSURE[0001]The present invention relates to the field of display technologies, and in particular to a ghost relieving circuit for a display panel, a display panel and a ghost relieving method for a display panel.BACKGROUND OF THE DISCLOSURE[0002]With the development of display technology, liquid crystal display (LCD) has gradually replaced the cathode ray tube (CRT) display device due to its advantages of lightness, thinness and low radiation. Liquid crystal displays are widely used in information terminals such as computers, smart phones, mobile phones, car navigation devices, and electronic books, and become the most common display devices.[0003]On the one hand, there is only one gamma chip on the liquid crystal display panel currently used. Please refer to FIG. 1, which is a schematic diagram of three areas in a liquid crystal display panel of the prior art. The entire liquid crystal display panel shares a common voltage Vcom, so that only the display effect of ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G09G3/36G09G3/20
CPCG09G3/3677G09G2310/027G09G3/3614G09G3/3688G09G3/3607G09G3/2044G09G2320/0257G09G2310/08G09G3/3696
Inventor CHEN, YUYEHWU, YUAN-LIANGSUN, LEI
Owner XIANYANG CAIHONG OPTOELECTRONICS TECH CO LTD